Write an equation for the tangent line to to the curve at the given point. Simplify your answer .
a. F(x)= x^4 +x^3 -2x^2 at negative x intercept
b. g(x)= 5sin (x^2) -2e^x +3cos(2x) +1 at y-intercept
c. 2xy^3= 5x^(3)y-6 at point (-1,2)
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